PDF malware analysis — malicious · f5674cca25bdd286

MALICIOUS

PDF

115.9 KB Created: 2021-07-01 09:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 4cca63d3c693ce8bdfc74371dcd75c71 SHA-1: c1c6e3b079cbb712eec54837a58e41fdbca335de SHA-256: f5674cca25bdd28624f2ba8accf001ffc4f555ed5ce0b6472184b53eb5f8edcb

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The document body is heavily obfuscated, but the presence of embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9639

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b54a5c3e785---fodabuzizomakejutufogame.pdf In PDF document text
- https://bawaniint.com/ckfinder/userfiles/files/28438356121.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160757a5b2c65f---64475246100.pdfIn PDF document text
- http://rent2day.ca/ci2/userfiles/files/pebekopitax.pdfIn PDF document text
- https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/c74d67977fc0966c8f512a2db0ce18fd/47509604656.pdfIn PDF document text
- http://aeronautike.com/userfiles/file/72441929528.pdfIn PDF document text
- https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/228265b653b9f26fc904fd3fde092730/34975886624.pdfIn PDF document text
- https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/05983d7d565ed95f7bca5e5338a1cd11/togigokerudowifuji.pdfIn PDF document text
- http://chrisdepanneservices.fr/Sites/cds/files/sevikajixaragiketevazobe.pdfIn PDF document text
- https://motelandratecuci.ro/userfiles/file/zoraramolekazuvexokovadik.pdfIn PDF document text
- https://equator-maritime.com/userfiles/file/18712130338.pdfIn PDF document text
- http://anhuizhkj.com/upload_fck/file/2021-5-22/20210522182820683353.pdfIn PDF document text
- https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lfqehs44hr5pcimugu3510tnoo/nasudon.pdfIn PDF document text
- http://meteosputnik.ru/userfiles/file/85576735118.pdfIn PDF document text
- https://altbuket.ru/files/matipulamunujepuvopuwa.pdfIn PDF document text
- http://brkvinc.com/userfiles/file/44354174521.pdfIn PDF document text
- http://www.jobsincrete.gr/images/_user_na/file/49477388969.pdfIn PDF document text
- http://hutbephottaihaiphong24h.com/upload/files/90275826045.pdfIn PDF document text
- https://topaldanang.com/uploads/image/files/lizisuxijupibofi.pdfIn PDF document text
- http://xn--d1achljw0b.xn--p1ai/content/upload/15629463246.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8535bc07a7---jerosi.pdfIn PDF document text
- https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cbb66bd42---sobamod.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ecb0a24d58f1f5c4a557ac117e1d712e/xufof.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cec8001aeb5---xixogoba.pdfIn PDF document text
- https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9ad56074b4b790f0b90e06650c3f2be1/54472781386.pdfIn PDF document text
- http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/nilaziwez.pdfIn PDF document text
- http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8929bd61a---26414123861.pdfIn PDF document text
- http://gdbchurch.com/clients/43262/File/19067719638.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+journals+of+abraham+maslowPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00014df7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14DF7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001660e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1660E	10708 bytes
SHA-256: `5804e044c3ad135ddc6d1ae73ce393b690d4203c8e98bec1b754e00430ca9fa6`
`font_02_sfnt_off00017e82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17E82	17980 bytes
SHA-256: `9333eaaf3924efcbe663ccddbca327ee3ca172ee69cca5600a3130c6d8dda02e`
`font_03_sfnt_off0001ac27.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1AC27	16088 bytes
SHA-256: `0e3d63f173342003c62a86c726d4d5a85e7f52d44cf06618766a4fa08a0866bf`

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